The Synthesis Of Stable ZrO₂（Y₂O₃）Nano-ceramic Materials By The Method Of High Temperature Mechanical

The first20years of the21st century is a crucial period for the development of nanotechnology. As the special nature of nano-materials, nano technology and nano-materials applied to all areas of industrial production will lead to changes in product performance, or greatly enhanced. Using nano-technology to traditional industries, especially yes heavy industries transformation will bring new opportunities, which there’s much room for development, which has a large foreign company’s technical secrets. In this paper, chemical precipitation method and High temperature mechanical force method are adopted to synthesize nano-ceramic materials powder (ZrO2), and some research and discussion have been done in the best preparation technology.The precursors were synthesized by chemical precipitation method with Zirconium oxychloride and Yttria as raw materials. According to the DSC-TGA curves, the hot decomposition of precursor was determined, and the reasonable calcination temperature of powders was made. ZrO2powders were prepared by controlling the pH value of solution, changing the method of Y2O3doped, the precipitation temperature, pre-firing temperature, the calcination temperature, heat preservation time and the concentration of Y2O3doped. The ZrO2powders were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Experimental results showed that the best preparation techniques of ZrO2powders were that the pH value was10, the precipitation temperature was40℃, the pre-firing temperature was500℃, the calcination temperature was900℃, the heat preservation time was3h and the concentration of Y2O3doped was9%mol, Under these conditions, the powders is the best.The ZrO2powders were also prepared by high temperature-energy ball milling method and choosing the precursors synthesized by chemical precipitation method as raw materials. ZrO2powders were synthesized by changing the ball milling temperature, the ball milling time, balls/material weight ratio and the concentration of Y2O3doped. The Y2O3powders were characterized by X-ray diffraction and scanning electron microscopy. Experimental results showed the best preparation techniques of ZrO2powders were that the ball milling temperature was600℃, the ball milling time was2h, the balls/material weight ratio was15:1and the concentration of Y2O3doped was13%mol. Under these conditions, the Characterization of powder is the best.By comparing the above two experiments, We can get a conclusion that High temperature mechanical force method can not only synthesize ZrO2powder with simple preparation techniques and in a lower temperature, And under the same conditions can increase the maximum amount of Y2O3doping, which is important for the stabilizer Y2O3.